Automatic switch mounting



Patented Apr. 12, 1927.

- UNITED STATES HERBERT F. OBERGFELL, OF RIVER FOR-EST, ILLINOIS, ASSIGNOR, BY MESNE ASSIGN- n MENTS, TO AUTOMATIC ELECTRICy INC., OF CHICAGO, ILLINOIS, .A CORFORATION OF l DELAWARE.

Ap'pnanbn mea May 11,

The present invention relates in general to automatic switch mounting, more especially to the mounting arrangement of cerltain of such switches that are used inv automatic telephone systems.

Speciiically, the'invention relates to an, improved method of mounting the nonnumerical line switch and banks ofan auto-V matic telephone system, which permits greater ease in assembly, adjustment andv maintenance thereof. y

The drawings, comprising Figs. 1 and 2, show suflicient details of the switchmounth ings to illustrate the present invention.

Fig. 1 shows a section of a Keith line#V switch board of the Strowger system, as

Y switch, line switch, banks andvjack springs that will be referred to hereinafter. The bank B of Fig.V 1 is shown again in more detail in Fig. 44 on page 476 of the above reference.

Fig. 2 is the elevation ofa section of the mounting panel 31 of Fig. 1, showing the 'details of the bank mounting rod 33 and bank mounting clamps 38 that will be pointed out in detail hereinafter;

The line switch LS of Fig. 1 is a plunger- .type line switch such as is'sho'wn in detail in my co--pending application Serial No.

13,046, filed March 5, '1925.- Briefly, the line'v y vcompletely adjusted unit and` is ready to be.

switch LS is a non-numerical switchV ind-ividual to the line of an automatic telephonev System, whose principal---di'ity is to automatically operate, in response to the' initiation of a call by the removal of the receiver from the telephone, to connect the calling line to anv idle selecting switch, 'through the medium ofthe bank B. YCo-operating jwith the line'switch VLS is the master switch, shown in Fig. -42 ofthe above reference, which through the medium of the line switch guide shaft 44. of Fig. l keeps the AUTOMATIC SWITCH IVIOUNTING.

1925. serial Nb. 29,298.

plunger 6 of the line switchv standing opposite an idle bank contact. In performing this functionthe master` switch swings the PATENT' oFFlca line switch guideshaft 44 about an axis c The mounting.; vbracket which determines the location of this plunger guide shaft 44 is shown at the top of Fig. 45, and it vwill be noted that this bracket is rigidly vfastened vto the mounting` plate, such as 31 and 31` of Fig. 1;.v

that is,7the axis of the guide shaft is defi? intely located with respectrto the face of the mounting plate. Therefore,it is readily `seen that if the plungers 6 are to move freely through the bank B under control of the guide shaft 44, the bank B and the bearing pin 22 of the plunger mustbe carefully located with respect to the mounting brackets 31 and 31. Moreover, since the bearing` pin 22 permits the plungers 6 to move only in one plane, the lateral axis of the bank 36 must lie exactly at right angles to this beari y Accordingly, one of thejobjects of my in vention is to provldea newand improved methodof mounting the bank B in the frame, so` that it will be definitely located with respect to the axis of rotation of the master switch guide shaft.

In the process of manufacturing such acated Vwith respect to the mounting bracket v1. .ofthe main switch base 1 by adjusting the back stop screw 10 and the bearing pin 15 as set forth inI the above mentioned application; The line switch then forms a mounted upon'the line-switch board.

YAssume for the moment that the banks 36 are properly aligned with respect to the mountingplates 31 and 31 and the airis` which passes through the` pin V22 of the line switch, it is'still necessary to providemeans for adjustingithe. line switch itself sothat the bearing pin 22 will coincidewith the above mentioned axis.

Accordingly, -a further `object of this invention is tov provide any improved andA all) simpliiied means et mounting the plunger type line switch on the'switch board upw right, a `means that provides tor easy adjustment and alignment ot the switch.

Having.;l thus described the objects of my invention, l will now proceed with a detailed description of the bank mounting' of my invention.

The bank assembly B consists et' a bank of terminals 3G supported by a mounting strip 35, and in the manufacture of the bank alignment is made with respect to this mounting strip 35. ln mountingr the bank in the' line-switch board-` it is therefore necessary only to align the" mounting' strip 35 with respect to the tace et the mounting,r platesll and 3l in order to have the banks properly aligned. For this purpose l provide* the bank mounting rods 33 and 33 in which I have cut grooves il? lo receive the mounting:il plate These grooves are accurately machined so that the mount-ing:` jiilates andl et Fig. El will be correctly spa-ced vertically with respect to each other when inserted in the groove 3T. rPhe bank mounting plates 35 are held into engagement with the` mounting rods 3? and 83 by means ot' the clamp 38, so7 that the entire bank assembly can be assembled as a unit before being placed into the line-switch board upright. ln order to space" the banks in and out with respect to the mounting tace of the uprinlits 3l and lll" l `provide tl i spacing` collars 32 and 32 which are accurately machined and which space the bank mounting.,im rods" 33 and 33 definitely with respect to the mounting plates 3l and 3l', respectively. The" mounting plates 3l and 31 are drilled to take a machine screw which passes through these plates, through the spacing;` collars` 32 and 32, and through the bank mounting* rods 33 and 33', being threaded into the latter.' In the line-switch board o'l the above reference, twenty-tive banks would be mounted on one pair of bank mounting' rods" andthe assembly held to the board by means ete-ight machine screw such as 3l. andI 34e', four being placed into andi tl'irougih cach oi' the bank mountingr rods. The holes drilled in the mounting plates to receive the bank mounting' screws 3ft and I-l-l/ are accuiiitely drilled and countensunk so that when the eight screws are. drawn up tight the asseliibly of twenty-live banks is accurately aligned, vertically und in both ways horizontally. The mounting; screws 3d extend through the bank rods 33 and the bank mounting clamp 3S, the latter beingr held in place by a nut which not only serves to hold the* bank" in place, but also to lock the bank mounting screw. The switch. mountingr clamps Si?M which do not come in suclr a, space as to he hel-d on by the bank mountingr` screw 34]:E are attache'dl to the` bank niountine4r rod 3375.5* ttistild screw 38 asshdwn in FiglQ;

Having' thus assembled the banks in the lincswitclr board, they are properly aligned and are ready to receive theswitches, the mounting ot which will new be described. The mounting plate l of the switch LS is drilled to pass over the heads oit screws 4:3, and slotted to engage the lang'es of those screws as the switch is slid into place. The insulated screws Li3 are arranged to lit into these slots with a minimum ot vertical play, thus minimizing the vertical alignment of the switch after it is mounted on the lineswirch board. ift is the established practice to insulate `these line switches LS from the mounting trame, and I have, therefore, pr0- vided the insulating strip et() which extends over the entire tace ot the mounting` plate 31 to insulate the line switches therefrom. ln mounting the line switch, it is therefore only ne( ary to insert the male jack ol" the line switch into the :female jack 4l which is mounted on the mountingplate 31; slip the screws 4:3 through the slot and the base oi the li'nc switch and lighten them up after the line switch has been adjusted correctly right and lett so that the bearing' pin 22 is in correct alignment with the axis oi the master switch. Very little up and down adjustment., that is adjustment parallel to the master switch guide shatt elfi, is necessary because of' the close tit between the insulated screws 43 and the slot in the base ot' the line switch. The screws fl?) being insulated aid the insulating;l strip fl() in preventingr the traine ot the switch l from comim;lr in contact with the mounting' plate 3i.

It is easily seen that I have devised a new and eliieient method of mounting the banks and switches of the class described. The bank mounting: requires no adjustment to properlfY align the banks, and the line switch mountingr requires only adjustnient in one direction. thus providing: a method which is inexpensive because of the small amount ofl' labor required to properly align the switches and switch banks.

Having! thus described my invention,what I consider ne i and desire to have protected by Letters Patent is pointed out in the appended claims.

lhat is claimed is:

il.. ln an automatic. telejihone system, a. line switchbankand a lineswiteh arranged to plunge into saidbanli to establish conoce-1 tions therein. a; common mounting platoon opposite sides of which are mounted said line switch and bank, said bank being mounted by means of a Itn'ooved rod into which ay meinl'ier et the bank slips and by means et which the bank is located in one? direction, and a means comprising a. spacing` washer andy machine screw for locatingsaid rod in another direction with respect to said mounting plate.

2. In an automatic telephone system, a

lili

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plurality of line switch banks each having a mounting plate containing two- U-shaped slots, tivo mounting rods each containing a plurality of grooves into Which the U-shaped slots of said bank mountings snugly tit, a plurality of clamps arranged to hold said banks on said rods, switchboard mounting plate, and means comprising machine screws and spacing Washers Jfor mounting said bank assembly on said mounting plate.

3. In a telephone system, a mounting traine for supporting a plurality of switches and their co-operating switch banks, said frame consisting of apair of uprights, a rod mounted on cach upright on one side thereof spaced equidistant from the uprights and each having a plurality of grooves around "the rod, each groove in the saine plane as the corresponding groove on the other rod, a series of switch banks having forked ends registering With a groove in each rod, a Washer engaging each pair oit banks to retain the banks in the grooves, and a series of switches mounted on each upright each having an arm registering With one ofsaid banks. Y A v 4. In a telephone system, a plurality of automatic switches, a bank associated with each of said switches, a mounting frame for said switches and banks containing upright members, said switches being mounted on one side of said uprights and insulated therefrom, said banks being mounted on rods and spaced thereon by means of grooves inv said rods into which forked members of said banks tit, said assembly of banks and rods being mounted onY the opposite side of said uprights, one of said rods being held parallel to the switch mounting face` of each of said uprights by means of machine screws and spacing Washers.

5. A mounting for electrical devices comprising a plurality of devices liXed, in grooves upon a plurality of rods and delinitely located thereby With respect to each other and to said rods, a mounting plate and means for fastening said rods on and locating them with respect to said plate to locate said devices With respect thereto.

6. A mounting for electrical devices comprising rods containing grooves spaced at definite intervals along it, projections on said devices Ahaving forked ends registering with certain of said grooves, a mounting plate'to which said rods are attached and from which they are denitely spaced byV siiitablemeans, said rods, spacing means and projections cooperating to denitely locate said devices with respect to said mounting plate. f

HERBERT F. OBERGFELL.

(ill 

